UPDATE 1-Monier restructuring deal delayed-sources

* Three day delay for Monier restructuring deal

* Senior lenders remain confident deal will be approved

* Interest payment may not be paid

(Adds detail, background)

By Tom Freke

LONDON, June 30 (Reuters) - Last-minute talks have delayed the restructuring deal for French building materials company Monier Group [PAIPRM.UL], three sources with knowledge of the situation said on Tuesday.

The 1 billion euro ($1.41 billion) debt-for-equity swap was due to be signed on Monday, but is now expected to be put before lenders on Thursday, the sources said.

"Last minute negotiations on terms held up release of the restructuring agreement," said a senior lender source.

The lender group driving the deal had aimed to complete the restructuring process by Tuesday, when Monier is due to make a large interest payment on its debts, which total nearly 2 billion euros.

This interest may remain unpaid as the restructuring agreement includes a waiver on the payment, though banks are seen as reluctant to step in and push the company into insolvency, one of the sources said.

Senior lenders have said that the rescue package would be approved despite objections from lower-ranked loan holders. [ID:nLP372185]

The "steering committee" of senior lenders said In an investor update circulated on Monday that over the weekend they had worked closely with the company and agent bank over documentation issues.

($1=.7077 Euro)